Tee Pee was one of the first places I went out to eat as a freshman at ASU in 2002 and I'm still going back to this day. My favorite is their chimichanga. The prices aren't great but this meal comes with a load of sour cream, guacamole, and chips & salsa and is delicious.
It's an older building and the booths are anything but comfortable but the service and food are great. They also have a bar attached to the restaurant and speedy take-out service if you don't feel like dining in.
Their small parking lot is often full but it shows how good their food is. I have never had to wait for more than a few minutes for a spot and there is street parking if the lot is full.